Hi,
When I read Bootstrap 4 documentation, very often a class name has a prefix period (.). For example, .btn-group-toggle or .d-none and so on. What is the meaning of the period (.)? When I use classes in the HTML5 code, I don't think I enter them. For example, I could say
Why, then, in the docs they use this period?
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham
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